It would be easy to re-design the job for cheaper machining.. Do you really need to tap the holes? You might use self taping screws. Id the would work then you can do the work yourself with just a hand drill.
OK it you must use machine threads and they must be #4 size try "rivets" these work like pop rivets but leave a hollow thread insert in the hole that will take screws. Takes all of 5 seconds to install a thread hole. Think again about threading aluminum. It is not very strong, it would be easy for an end user to strip the #4 threads. Better to use the rivet or other steel thread insert. Even native nuts installed with flush rivets is better So try self threading screws first them go to threaded inserts, you could install 100 4-40 inserts in one hour using just hand tools. On Thu, May 18, 2017 at 9:54 AM, <[email protected]> wrote: > Hi, > > I have a square aluminum tube 5" X 5" with a .25" wall it's 8 1/2" long. > > I need 20 holes in each end tapped for 4/40 and 1/2" deep. > > This is for a Rubidium project. > > The local machine shop want's $360.00!!!! > > Anyone have a machining setup that could do the work a bit cheaper? > > If not I'll give it a try myself. > > Please contact me off list. > > Thanks! > > Corby Dawson > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/ > mailman/listinfo/time-nuts > and follow the instructions there. > -- Chris Albertson Redondo Beach, California _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
